environmentally benign practices, they can have excellent results. The new practices benefit the
environment and give the growers their success.”
H
OSU researcher in Malheur next tested straw mulch and found that it successfully held soil in
place and kept the ground moist with less irrigation. In addition, and unexpectedly, the
scientists found that the mulched soil created a home for beneficial beetles and spiders that
prey on onion thrips – a notorious pest in commercial onion fields – a discovery that could
reduce the need for pesticides. “I would never have believed that we could replace the artificial
pest controls that we had before and still keep our good results,” commented Steve Black, a
commercial onion farmer in Oregon, “but instead we have actually surpassed expectations.”
I
OSU researchers throughout the state have been working to reduce dependence on broad-
spectrum chemical spays that are toxic to many kinds of organisms, including humans.
“Consumers are rightly putting more and more pressure on the industry to change its reliance
on chemical pesticides, but they still want a picture-perfect product,” said Rick Hilton, an
entomologist at OSU’s Southern Oregon Research and Extension Centre, where researches
help pear growers reduce the need for highly toxic pesticides. Picture perfect pears are an
important product in Oregon and traditionally they have required lots of chemicals. In recent
years, the industry has faced stiff competition from overseas producers, so any new methods
that growers adopt must make sense economically as well as environmentally. Hilton is testing
a growth regulator that interferes with the molting of codling moth larvae. Another study used
pheromone dispensers to disrupt codling moth mating. These and other methods of integrated
pest management have allowed pear growers to reduce their use of organophosphates by two-
thirds and reduce all other synthetic pesticides by even more and still produce top-quality
pears. These and other studies around the state are part of the effort of the IPPC to find
alternative farming practices that benefit both the economy and the environment.
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